
def isleapyear(year):
    if year%4 == 0 and year%100 != 0 or year%400 == 0:
        return True
    return False

if __name__ == '__main__':
    n = int(input())
    if isleapyear(n):
        print('is leap year')
    else:
        print("no, isn't leap year ")